TREATMENT OF ECTOPIC ERUPTING MANDIBULAR FIRST PERMANENT MOLAR CAUSED BY IMPROPERLY RESTORED STAINLESS STEEL CROWN : CASE REPORT

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Journal of the Korean Academy of Pediatric Dentistry 2000;27(1):98-1.
Published online February 29, 2000.

TREATMENT OF ECTOPIC ERUPTING MANDIBULAR FIRST PERMANENT MOLAR CAUSED BY IMPROPERLY RESTORED STAINLESS STEEL CROWN : CASE REPORT

부적절하게 수복된 stainless steel crown에 의해 야기된 하악 제1대구치 이소맹출의 치험례

박주석, 최병재, 손흥규

연세대학교 치과대학 소아치과학교실

Abstract

Ectopic eruption is out of a normal position by local eruption disturbance in the developing permanent molar. The prevalence of ectopic eruption is reported to be the between 2 and 6%, most often associated maxillary first permanent molar whereas, the occurrence for the mandibular is quite rare. The etiologic factors of ectopic eruption are inadequate arch length, lack of growth in the posterior region of the jaw, mesially inclined eruption path of first permanent molars, abnormally large first permanent molars, hereditary factor and a stainless steel crown which has been improperly restored. Ectopic eruption can be treated by the use of brass wire, separating elastics, distal disking and Humphrey appliance and the use of removable appliance and cervical traction headgear after extraction of the second primary molar. This case was that lower right first permanent molar was mesially tilted state by locking on the stainless steel crown of a lower right second primary molar. The stainless steel crown was removed and Humphrey appliance was set. Like this case, ectopic eruption could be happened by the stainless steel crown which improperly restored. In restoration of the stainless steel crown, selection of proper size, trimming and contouring are very important.

Key Words: Ectopic eruption, Humphrey appliance, Mandibular first permanent molar, Stainless steel crown